Ayhan Akbal

Pilot symbol based channel estimation and capacity evaluation in FBMC and OFDM

This paper presents pilot symbol aided channel estimation in Filter Bank Multicarrier (FBMC). FBMC has been employed widespread in communication applications because of its good spectral behaviors. Unlike Orthogonal Frequency Division Multiplexing, FBMC structure avoids imaginary interference. So that auxiliary symbols are employed and decrease peak to power ratio and improve achievable capacity. OFDM and FBMC are compared about achievable of channel estimation with pilot symbols. The achievable capacity is increased with linear precoding by interference cancellation. Using two or three auxiliary pilot symbols instead of one is purposed and achievable capacity via Signal to Noise Ratio (SNR) is compared. OFDM and FBMC with coding and auxiliary symbols are discussed about capacity and numerical results are realized in Matlab.

Automatic fault detection with Bayes method in university campus network

In recent years, the use of the internet has become widespread with developing technologies. Internet is used for many needs, especially social media. Today, internet is needed for remote use of electronic devices used in homes and offices. Continuous access to the internet is very important for the quality of life of people. In this study, a proposal was made for early detection of basic faults that may occur in the lines of internet access devices. The recommended method was carried out in the university campus environment. Fiber cable traffic, which provides internet streaming between departments within the campus, is constantly monitored via switch. As a result, a set of data has been received from the switch ports to which the fiber cables are connected. Failure detection has been performed taking into account the changes occurring in this data. Eliminating the malfunctions that may occur in the Internet line requires long time and workload. Thanks to this developed method, maintenance studies are made by providing early detection of failures that can occur in university campus environment. A software has been developed to monitor the uplinks of the switches in the system rooms and retrieve the data. The Bayesian classifier has been used to process the results and obtain the results. Over 90% classification success was achieved using the Naive Bayes method.

ZF and MMSE application for FBMC-QAM

In next generation communication systems high data rate, and higher transmission capacity through wireless channel are important for researchers. Filter bank based multicarrier (FBMC) modulation with offset quadrature amplitude modulation (OQAM) makes researchers interested due to its advantages over orthogonal frequency division multiplexing (OFDM). The paper indicates that OFDM, FBMC-QAM, multiple-input multiple output (MIMO) transmission layouts and channel estimation layouts study same logic. Also MIMO receiver design is realized for FBMC such as ZF, MMSE, ML techniques. Finally, FBMC-QAM and OFDM is compared about magnitude response, amplitude of subcarriers in frequency and BER performance and MIMO receiver techniques are compared about SER to SNR.

A new approach to spectral domain method: functional programming

The Spectral Domain Method is powerful technique to analyze planar microwave circuits. But available conventional programming languages used in the literature does not give the enough speed to use the Spectral Domain Method to develop package analysis program. Functional approach to Spectral domain Method gives a high level of programming and a variety of features which help to build elegant yet powerfully and general libraries of functions.

Fast rigorous analysis of rectangular waveguides by optimized 2D-TLM

In this paper, The optimized 2D-TLM as been introduced and applied to rectangular waveguides which is widely used. Results obtained by using optimized 2D-TLM were compared with analytic results and shown to be accurate.